CN117588290A

CN117588290A - Monitoring method and monitoring device for trapping efficiency of particulate matter trap and vehicle

Info

Publication number: CN117588290A
Application number: CN202311714780.1A
Authority: CN
Inventors: 谢熙; 王国栋; 褚国良; 秦海玉; 高丽丽
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-12-12
Filing date: 2023-12-12
Publication date: 2024-02-23

Abstract

The application provides a monitoring method, a monitoring device and a vehicle for trapping efficiency of a particulate matter trap, wherein the method comprises the steps of acquiring a current differential pressure value, a first flow resistance carbon load and a second flow resistance carbon load, wherein the first flow resistance carbon load is the flow resistance carbon load acquired in a current acquisition period, and the second flow resistance carbon load is the flow resistance carbon load acquired in a previous acquisition period; a calculation step of determining a flow resistance carbon load change rate according to the first flow resistance carbon load, the second flow resistance carbon load and the time length of the acquisition period; and a judging step, when the first condition is met and one or two of the second condition and the third condition are met, timing is carried out until the timing duration is longer than the set time limit value, determining that the filtration efficiency of the particulate matter trap is unqualified, and ending the monitoring. The method solves the problem of inaccurate monitoring of the trapping efficiency of the particulate matter trap.

Description

Monitoring method and monitoring device for trapping efficiency of particulate matter trap and vehicle

Technical Field

The invention relates to the technical field of particulate matter trapping, in particular to a monitoring method and device for trapping efficiency of a particulate matter trap, a computer readable storage medium and a vehicle.

Background

Particulate matter trapping technologies (Diesel Particulate Filter, DPF) filter and trap particulates in engine exhaust mainly through diffusion, deposition and impact mechanisms. The exhaust gas flows through the trap where particles are trapped in the filter element of the filter body, leaving cleaner exhaust gas to be discharged into the atmosphere. The wall-flow honeycomb ceramic filter is widely applied at present, and is mainly used for engineering machinery and urban buses at present. With the lengthening of the working time, more and more particulate matters are accumulated on the DPF, so that the filtering effect of the DPF is affected, the exhaust back pressure is increased, the ventilation and combustion of the engine are affected, the power output is reduced, and the oil consumption is increased.

In the prior art, the monitoring of the trapping efficiency of the particulate matter trap is limited to the monitoring of a single variable to judge the filtering efficiency of the particulate matter trap, so that error easily occurs to cause inaccurate filtering efficiency of the DPF.

Disclosure of Invention

The main object of the present application is to provide a monitoring method, a monitoring device, a computer readable storage medium and a vehicle for the trapping efficiency of a particulate matter trap, so as to at least solve the problem of inaccurate monitoring of the trapping efficiency of the particulate matter trap in the prior art.

To achieve the above object, according to one aspect of the present application, there is provided a method of monitoring trapping efficiency of a particulate matter trap, the method including: the method comprises the steps of obtaining a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value of two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading collected in a current collection period, the second flow resistance carbon loading is the flow resistance carbon loading collected in a previous collection period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is arranged is blocked by the particle catcher; a calculation step of determining a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period; and a judging step of timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing time is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle.

Optionally, obtaining the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading includes: monitoring whether the particulate matter trap meets a release condition, wherein the release condition is that the ambient pressure, the ambient temperature, the engine rotating speed, the fuel injection quantity, the fuel liquid level, the volume flow of the exhaust gas and the accumulated carbon loading are in a preset range, and a detection device and the particulate matter trap do not have faults, and the detection device comprises a differential pressure sensor which is used for detecting pressure difference values at two ends of the particulate matter trap; under the condition that the release condition is not met, continuing to monitor the particulate matter catcher until the release condition is met; and under the condition that the release condition is met, acquiring the current differential pressure value, the first flow resistance carbon loading and the second flow resistance carbon loading.

Optionally, obtaining the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading includes: acquiring the current differential pressure value, a previous differential pressure value, a first volume flow and a second volume flow, wherein the previous differential pressure value is a differential pressure value of the last collection period at two ends of the particle catcher, the first volume flow is a volume flow of the waste gas passing through the particle catcher in the current collection period, and the second volume flow is a volume flow of the waste gas passing through the particle catcher in the last collection period; obtaining a first flow resistance according to the ratio of the current pressure difference value to the first volume flow, and obtaining a second flow resistance according to the ratio of the previous pressure difference value to the second volume flow, wherein the first flow resistance and the second flow resistance are respectively flow resistances of the exhaust gas in the current collection period and the previous collection period, and the flow resistance is a blocking force suffered by the flow process of the exhaust gas when the exhaust gas passes through the particulate matter trap; and looking up a flow resistance carbon loading comparison table according to the first flow resistance and the first volume flow to obtain the first flow resistance carbon loading, and looking up the flow resistance carbon loading comparison table according to the second flow resistance and the second volume flow to obtain the second flow resistance carbon loading, wherein the flow resistance carbon loading comparison table is a comparison table of the flow resistance carbon loading, the flow resistance and the volume flow.

Optionally, determining the flow resistance carbon loading rate of change according to the first flow resistance carbon loading, the second flow resistance carbon loading, and the time length of the acquisition period includes: calculating the difference value of the first flow resistance carbon loading and the second flow resistance carbon loading to obtain a flow resistance carbon loading change difference value; and calculating the ratio of the flow resistance carbon load change difference value to the time length of the acquisition period to obtain the flow resistance carbon load change rate.

Optionally, in the case that the first condition is satisfied and one or both of the second condition and the third condition is satisfied, counting time is performed until the counted time is longer than the set time limit value, and before determining that the particulate matter trap filter efficiency is not qualified, the method further includes: obtaining a model carbon load corresponding to a current mileage and a mileage carbon load, wherein the model carbon load is a carbon load corresponding to the current mileage generated by simulation software for simulating the operation of the particulate matter catcher, and the mileage carbon load is a carbon load of the particulate matter catcher when the current mileage is driven in historical data; determining a minimum of the model carbon loading and the mileage carbon loading as the predicted carbon loading.

Optionally, under the condition that the first condition is met and one or both of the second condition and the third condition are met, timing is performed until the timing duration is greater than a set time limit value, the filtering efficiency of the particulate matter trap is determined to be unqualified, and the monitoring is finished, including: a timing step of performing timing when the first condition, the second condition, and the third condition are satisfied; a zero clearing step of clearing the time length of the timing under the condition that any one of the first condition, the second condition and the third condition is not met; and sequentially repeating the zero clearing step and the timing step at least once, determining that the filtering efficiency of the particulate matter catcher is unqualified when the timing duration is greater than the set time limit value, and ending the monitoring.

Optionally, in the case where the first condition is satisfied and one or both of the second condition and the third condition are satisfied, after timing, the method further includes: and if the time duration of the timing is less than or equal to the time limit value, sequentially repeating the acquisition step, the calculation step and the judgment step at least once until the monitoring is finished.

According to yet another aspect of the present application, there is provided a monitoring device for particulate trap trapping efficiency, the device comprising: the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, the current differential pressure value is a current differential pressure value at two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading acquired in a current acquisition period, the second flow resistance carbon loading is the flow resistance carbon loading acquired in a previous acquisition period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is arranged is blocked by the particle catcher; a calculation unit for determining a flow resistance carbon loading rate of change according to the first flow resistance carbon loading, the second flow resistance carbon loading, and the time length of the acquisition period; and the judging unit is used for timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing duration is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle.

According to another aspect of the present application, there is provided a computer readable storage medium, the computer readable storage medium including a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform any one of the methods.

According to still another aspect of the present application, there is provided a vehicle including: the apparatus comprises a particulate trap, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.

In the method for monitoring the trapping efficiency of the particulate matter trap, firstly, acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value at two ends of the particulate matter trap, the first flow resistance carbon loading is a flow resistance carbon loading collected in a current collection period, the second flow resistance carbon loading is the flow resistance carbon loading collected in the previous collection period, and the flow resistance carbon loading is the quantity of carbon contained in the particulate matter trap per unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particulate matter trap is arranged is blocked by the particulate matter trap; then, a calculation step of determining a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period; and finally, a judging step, namely, timing is carried out under the condition that a first condition is met, and one or two of a second condition and a third condition are met, until the timing time is longer than a set time limit value, determining that the filtering efficiency of the particulate matter trap is unqualified, and ending the monitoring, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is a minimum value of the historical flow resistance carbon load of the current mileage of the vehicle. According to the method, when the relation between the differential pressure value measured by the differential pressure sensor and the differential pressure threshold value, the change rate of the flow resistance carbon load and the relation between the flow resistance carbon load and the model carbon load and the relation between the flow resistance carbon load and the mileage carbon load are used, and when the continuous monitoring differential pressure value is smaller than the differential pressure threshold value, the change rate of the flow resistance carbon load is smaller than the change rate threshold value, the accumulated monitoring time of the flow resistance carbon load smaller than the model carbon load and the accumulated monitoring time of the mileage carbon load exceeds the set time limit value, the low filtration efficiency fault of the particulate matter catcher is reported. Under the condition of ensuring the monitoring effect, the upgrading cost is reduced, and the problem of inaccurate monitoring of the trapping efficiency of the particulate matter catcher is solved.

Drawings

Fig. 1 is a block diagram showing a hardware configuration of a mobile terminal that performs a method of monitoring trapping efficiency of a particulate matter trap according to an embodiment of the present application;

FIG. 2 illustrates a flow chart of a method for monitoring particulate trap efficiency provided in accordance with an embodiment of the present application;

FIG. 3 is a flow chart illustrating a method for monitoring data acquisition of particulate matter trap trapping efficiency according to an embodiment of the present application;

FIG. 4 is a flow chart illustrating a method for determining particulate matter trap efficiency according to an embodiment of the present application;

FIG. 5 illustrates an algorithm flow chart of a method for monitoring particulate matter trap trapping efficiency in accordance with one embodiment of the present application;

fig. 6 shows a block diagram of a monitoring device for trapping efficiency of a particulate trap according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

102. a processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terms related to the embodiments of the present application:

particulate matter: particulate matters contained in the tail gas of the engine generally comprise two components, namely a boot component and an ash component, wherein the boot component is a part which can be burnt through regeneration, the ash component is a non-combustible component and can be accumulated in the DPF all the time, and when a certain accumulated amount is reached, ash removal is needed to be carried out in a service station;

differential pressure sensor: the pressure difference between two ends of the particle catcher is measured, and the catching efficiency of the particle catcher is estimated;

trapping efficiency: indicating the ability of the particle trap to trap particles.

As described in the background art, the prior art is limited to monitoring a single variable to determine the filtration efficiency of the particulate matter trap, and in order to solve the problem of inaccurate monitoring of the filtration efficiency of the particulate matter trap, embodiments of the present application provide a monitoring method, a monitoring device, a computer-readable storage medium, and a vehicle for the filtration efficiency of the particulate matter trap.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the operation on a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of a mobile terminal of a method for monitoring the trapping efficiency of a particulate matter trap according to an embodiment of the present invention. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a display method of device information in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-described method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In this embodiment, a method of monitoring the trapping efficiency of a particulate matter trap operating on a mobile terminal, a computer terminal or similar computing device is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and although a logical sequence is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in a different order than that illustrated herein.

FIG. 2 is a flow chart of a method of monitoring particulate trap efficiency according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

step S201, namely an acquisition step, of acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value of two ends of the particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading acquired in a current acquisition period, the second flow resistance carbon loading is the flow resistance carbon loading acquired in a previous acquisition period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is positioned is blocked after passing through the particle catcher;

Specifically, the differential pressure sensor installed in the particulate matter trap measures the pressure difference between two ends of the particulate matter trap, detects the flow resistance carbon load in the previous collection period of the particulate matter filtered by the particulate matter trap, namely the second flow resistance carbon load, and detects the flow resistance carbon load in the subsequent collection period of the particulate matter filtered by the particulate matter trap, namely the first flow resistance carbon load.

Step S202, namely a calculation step, wherein the flow resistance carbon load change rate is determined according to the first flow resistance carbon load, the second flow resistance carbon load and the time length of the acquisition period;

specifically, a flow resistance carbon loading variation difference is calculated according to the first flow resistance carbon loading and the second flow resistance carbon loading, so that the flow resistance carbon loading variation difference in unit time is calculated, and the flow resistance carbon loading variation rate is obtained.

Step S203, namely a determining step, of timing when a first condition is satisfied and one or both of a second condition and a third condition are satisfied, until a time period of timing is longer than a set time limit value, determining that the filtration efficiency of the particulate matter trap is not qualified, and ending the monitoring, where the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is a minimum value of a historical flow resistance carbon load of the current mileage of the vehicle;

Specifically, when the first condition and the second condition are satisfied, or the first condition and the third condition are satisfied, or both the first condition and the second condition and the third condition are satisfied, timing is performed, that is, the duration of time when one of the conditions is satisfied is monitored, and when the duration of time when the condition is satisfied is greater than a set time limit, it is determined that the particulate matter trap filter efficiency is failed and the monitoring is finished.

Through the embodiment, firstly, the current differential pressure value, the first flow resistance carbon loading and the second flow resistance carbon loading are obtained, wherein the current differential pressure value is the current differential pressure value at two ends of the particulate matter trap, the first flow resistance carbon loading is the flow resistance carbon loading collected in the current collection period, the second flow resistance carbon loading is the flow resistance carbon loading collected in the previous collection period, and the flow resistance carbon loading is the quantity of carbon contained in the particulate matter trap in unit mass or volume when the flow process of exhaust gas discharged by a vehicle where the particulate matter trap is located is blocked by the blocking force when passing through the particulate matter trap; then, a calculation step of determining a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period; and finally, a judging step, namely, timing is carried out under the condition that a first condition is met, and one or two of a second condition and a third condition are met, until the timing time is longer than a set time limit value, determining that the filtering efficiency of the particulate matter trap is unqualified, and ending the monitoring, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is a minimum value of the historical flow resistance carbon load of the current mileage of the vehicle. According to the method, when the relation between the differential pressure value measured by the differential pressure sensor and the differential pressure threshold value, the change rate of the flow resistance carbon load and the relation between the flow resistance carbon load and the model carbon load and the relation between the flow resistance carbon load and the mileage carbon load are used, and when the continuous monitoring differential pressure value is smaller than the differential pressure threshold value, the change rate of the flow resistance carbon load is smaller than the change rate threshold value, the accumulated monitoring time of the flow resistance carbon load smaller than the model carbon load and the accumulated monitoring time of the mileage carbon load exceeds the set time limit value, the low filtration efficiency fault of the particulate matter catcher is reported. Under the condition of ensuring the monitoring effect, the upgrading cost is reduced, and the problem of inaccurate monitoring of the trapping efficiency of the particulate matter catcher is solved.

In order to reduce the frequency and range of monitoring and improve the monitoring efficiency and accuracy, in an alternative embodiment, the step S201 includes:

step S2011, monitoring whether the particulate matter trap meets a release condition, where the release condition is an ambient pressure, an ambient temperature, an engine speed, a fuel injection amount, a fuel level, a volumetric flow rate of the exhaust gas, and an accumulated carbon load of the vehicle are within predetermined ranges, and a detection device and the particulate matter trap are not in failure, the detection device includes a differential pressure sensor, and the differential pressure sensor is used for detecting a pressure difference value between two ends of the particulate matter trap;

in particular, the satisfaction of the release condition means that the emission condition of the vehicle during running has reached the environmental protection requirement, and the exhaust emission of the vehicle can be considered relatively clean. If the release condition is not satisfied, the monitoring is directly carried out, so that the monitoring result is inconsistent with the actual emission condition, misjudgment can be generated, and unnecessary monitoring cost and trouble are increased. Therefore, before emission monitoring is performed, it is necessary to ensure that the emission condition of the vehicle has reached a prescribed standard, that is, that the release condition is satisfied. Therefore, the frequency and the range of monitoring can be effectively reduced, and the efficiency and the accuracy of monitoring are improved.

Step S2013, continuing to monitor the particulate matter catcher until the release condition is met under the condition that the release condition is not met;

specifically, in the case where the above release condition is not satisfied, it is indicated that the emission condition of the vehicle does not reach the prescribed standard, the particulate matter trap trapping efficiency is already in a failure state, and monitoring needs to be continued until the release condition is reached.

Step S2015, acquiring the current differential pressure value, the first flow resistance carbon loading and the second flow resistance carbon loading when the release condition is satisfied;

specifically, the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading can be obtained and subsequently measured and compared only when the release condition is satisfied to determine whether emission monitoring is required.

In order to monitor the condition of the trapping efficiency of the particulate matter trap, in an alternative embodiment, as shown in fig. 3, the step S201 further includes:

step S2012, obtaining the current differential pressure value, a previous differential pressure value, a first volumetric flow rate and a second volumetric flow rate, wherein the previous differential pressure value is a differential pressure value of the previous collection period at both ends of the particulate matter trap, the first volumetric flow rate is the exhaust gas volumetric flow rate passing through the particulate matter trap in the current collection period, and the second volumetric flow rate is the exhaust gas volumetric flow rate passing through the particulate matter trap in the previous collection period;

Specifically, the performance of the particulate matter trap may be monitored by acquiring the current differential pressure value, the previous differential pressure value, the first volumetric flow rate, and the second volumetric flow rate, the current differential pressure value and the previous differential pressure value may be used to understand a trend of a resistance change of the particulate matter trap, and the first volumetric flow rate and the second volumetric flow rate may be used to understand a trend of a change of the exhaust volumetric flow rate.

Step S2014, obtaining a first flow resistance according to a ratio of the current differential pressure value to the first volumetric flow rate, and obtaining a second flow resistance according to a ratio of the previous differential pressure value to the second volumetric flow rate, where the first flow resistance and the second flow resistance are flow resistances of the exhaust gas in the current collection period and the previous collection period, respectively, and the flow resistance is a blocking force suffered by a flow process of the exhaust gas when the exhaust gas passes through the particulate matter trap;

specifically, the first flow resistance may be obtained according to a ratio of the differential pressure value to the first volumetric flow rate, which indicates a blocking force of the exhaust gas flowing through the fir-tree particulate matter trap, and the second flow resistance may be obtained according to a ratio of the previous differential pressure value to the second volumetric flow rate, which indicates a blocking force of the exhaust gas flowing through the particulate matter trap in the previous collection period.

Step S2016, obtaining the first flow resistance carbon load by checking a flow resistance carbon load comparison table according to the first flow resistance and the first volumetric flow rate, obtaining the second flow resistance carbon load by checking a flow resistance carbon load comparison table according to the second flow resistance and the second volumetric flow rate, wherein the flow resistance carbon load comparison table is a comparison table of the flow resistance carbon load, the flow resistance and the exhaust gas volumetric flow rate;

specifically, the relation between the flow resistance and the exhaust gas volume flow is determined through a flow resistance carbon loading comparison table, and the corresponding flow resistance carbon loading is calculated, so that the condition of the trapping efficiency of the particulate matter trap can be evaluated.

In order to evaluate the trend of the flow resistance carbon loading, in an alternative embodiment, the step S202 includes:

step S2021, calculating a difference between the first flow resistance carbon loading and the second flow resistance carbon loading to obtain a flow resistance carbon loading variation difference;

specifically, the difference between the first flow resistance carbon loading and the second flow resistance carbon loading is the flow resistance carbon loading variation difference.

Step S2022, calculating a ratio of the flow resistance carbon load variation difference to the time length of the acquisition period to obtain the flow resistance carbon load variation rate;

Specifically, the ratio of the flow resistance carbon load variation difference to the time length of the acquisition period is the flow resistance carbon load variation rate.

In order to further improve the accuracy of the monitoring, in an alternative embodiment, before the step S203, the method further includes:

step S301, obtaining a model carbon load corresponding to a current mileage and a mileage carbon load, wherein the model carbon load is a carbon load corresponding to the current mileage generated by simulation software for simulating the operation of the particulate matter catcher, and the mileage carbon load is a carbon load of the particulate matter catcher when the current mileage is driven in historical data;

specifically, the carbon load corresponding to the current mileage generated by simulation under normal conditions is the model carbon load, and the carbon load corresponding to the current mileage in the history data under normal conditions is the mileage carbon load.

Step S302, determining the minimum value of the model carbon loading and the mileage carbon loading as the predicted carbon loading;

specifically, the minimum value between the model carbon loading and the mileage carbon loading is the predicted carbon loading.

In order to find and deal with the problem of the particulate matter trap in time, the particulate matter trap trapping efficiency is more accurately estimated, and in an alternative embodiment, the step S203 includes:

Step S2031 of performing timing when the first condition, the second condition, and the third condition are satisfied;

specifically, as shown in fig. 4, when the current differential pressure value measured by the differential pressure sensor is smaller than the differential pressure threshold and the flow resistance carbon load change rate is smaller than the change rate threshold and the flow resistance carbon load is smaller than the model predicted carbon load, that is, the first condition, the second condition and the third condition are all satisfied, and the monitoring time begins to be accumulated, that is, timing is performed.

Step S2032 of resetting the time length of the timer when any one of the first condition, the second condition, and the third condition is not satisfied;

specifically, when the current differential pressure value measured by the differential pressure sensor is greater than or equal to a differential pressure threshold value, or the flow resistance carbon load change rate is greater than or equal to the change rate threshold value, or the flow resistance carbon load is greater than or equal to the predicted carbon load, that is, any one of the first condition, the second condition and the third condition is not satisfied, the monitoring time is cleared, that is, the timed duration is cleared.

Step S2033, repeating the step S2031 and the step S2032 at least once in sequence until the time length of timing is greater than the set time limit value, determining that the filtration efficiency of the particulate matter trap is not qualified, and ending the monitoring;

Specifically, step S2031 and step S2032 are repeated at least once in sequence until the time length of the timer is greater than the set time limit, which indicates that the particulate matter trap fails to achieve the required filtration efficiency within the set time, determines that the particulate matter trap fails to pass the filtration efficiency, and ends the monitoring. Therefore, the problem of the particle catcher can be found and treated in time, and the failure rate and the failure efficiency of the particle catcher can be more ensured when the second condition and the third condition are met, so that the normal operation of the particle catcher is ensured.

In order to evaluate the trapping efficiency of the particulate matter trap, in an alternative embodiment, the step S203 further includes:

step S2034, when the first condition is satisfied and the second condition is satisfied, performing timing;

specifically, when the current differential pressure value measured by the differential pressure sensor is smaller than the differential pressure threshold value and the flow resistance carbon load change rate is smaller than the change rate threshold value, that is, the first condition is satisfied and the second condition is satisfied, the monitoring time begins to be accumulated, that is, timing is performed.

Step S2035, when the first condition is not satisfied and/or the second condition is not satisfied, resetting the time length of the timer;

Specifically, when the current differential pressure value measured by the differential pressure sensor is greater than or equal to a differential pressure threshold value, or the flow resistance carbon load change rate is greater than or equal to the change rate threshold value, that is, the first condition is not satisfied and/or the second condition is not satisfied, at this time, the monitoring time is cleared, that is, the time length of the timing is cleared.

Step S2036, repeating the step S2034 and the step S2035 at least once in sequence, determining that the filtration efficiency of the particulate matter trap is not qualified when the time duration is longer than the set time limit value, and ending the monitoring;

specifically, step S2034 and step S2035 are repeated at least once in sequence until the time length of the timer is greater than the set time limit, which indicates that the particulate matter trap fails to achieve the required filtration efficiency within the set time, determines that the particulate matter trap fails to pass the filtration efficiency, and ends the monitoring. Therefore, the problems of the particle catcher can be found and treated in time, and the normal operation of the particle catcher is ensured.

step S2037, when the first condition is satisfied and the third condition is satisfied, performing timing;

Specifically, when the current differential pressure value measured by the differential pressure sensor is smaller than the differential pressure threshold value and the flow resistance carbon load is smaller than the expected carbon load of the model, the first condition is met and the third condition is met, and at the moment, the monitoring time begins to be accumulated, namely, timing is performed.

Step S2038, when the first condition is not satisfied and/or the third condition is satisfied, resetting the monitoring time, that is, resetting the time length of the timer;

specifically, when the current differential pressure value measured by the differential pressure sensor is greater than or equal to a differential pressure threshold value, or the flow resistance carbon loading is greater than or equal to the predicted carbon loading, that is, the first condition is not satisfied and/or the third condition is not satisfied, at this time, the monitoring time is cleared, that is, the timed duration is cleared.

Step S2039, repeating the step S2037 and the step S2038 at least once in sequence, determining that the filtration efficiency of the particulate matter trap is not qualified when the time duration is longer than the set time limit value, and ending the monitoring;

specifically, step S2037 and step S2038 are repeated at least once in sequence until the time length of the timer is greater than the set time limit, which indicates that the particulate matter trap fails to achieve the required filtration efficiency within the set time, determines that the particulate matter trap fails to pass the filtration efficiency, and ends the monitoring. Therefore, the problems of the particle catcher can be found and treated in time, and the normal operation of the particle catcher is ensured.

In order to avoid accidental errors, in an alternative embodiment, after the step S203, the method further includes:

step S601, when the time length of the timing is less than or equal to the time limit value, repeating the step S201, the step S201 and the step S201 in sequence until the monitoring is finished;

specifically, the cumulative monitoring time in the case where the first condition is continuously monitored and one or both of the second condition and the third condition are satisfied does not exceed the time limit, which means that the particulate matter trap can achieve the required filtration efficiency within the set time limit at this time, but the acquisition step, the calculation step, and the determination step need to be sequentially repeated until the monitoring is ended in order to avoid an accidental error.

In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the method for monitoring the trapping efficiency of the particulate matter trap of the present application will be described in detail below with reference to specific embodiments.

The embodiment relates to a specific monitoring method for trapping efficiency of a particulate matter trap, as shown in fig. 5, comprising the following steps:

Step S1: monitoring whether the particulate matter catcher meets the release condition or not, and continuing monitoring under the condition that the release condition is not met;

step S2: when the release condition is met, comparing the differential pressure value detected by the differential pressure sensor with a differential pressure threshold value, the flow resistance carbon load change rate and change rate threshold value, and the flow resistance carbon load with the model carbon load and the mileage carbon load, and when the differential pressure value detected by the differential pressure sensor is smaller than the differential pressure threshold value, the flow resistance carbon load change rate is smaller than the change rate threshold value, the flow resistance carbon load is smaller than the model carbon load and the mileage carbon load, starting accumulating the monitoring time, otherwise, resetting the monitoring time;

step S3: and (3) comparing whether the monitoring time is greater than a time limit value, if so, entering a step S1, and when the continuously monitored differential pressure value is smaller than a calibrated limit value, the flow resistance carbon load change rate is smaller than the limit value, the flow resistance carbon load is smaller than the accumulated monitoring time of the model carbon load and the mileage carbon load and exceeds the time limit value, reporting the low filtration efficiency fault of the particulate matter trap.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides a monitoring device for the trapping efficiency of the particulate matter trap, and it should be noted that the monitoring device for the trapping efficiency of the particulate matter trap in the embodiment of the application can be used for executing the monitoring method for the trapping efficiency of the particulate matter trap provided in the embodiment of the application. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a monitoring device for trapping efficiency of a particulate matter trap provided in an embodiment of the present application.

Fig. 6 is a block diagram of a monitoring device for particulate trap trapping efficiency according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:

an obtaining unit 10, configured to perform an obtaining step, that is, obtain a current differential pressure value, a first flow resistance carbon load, and a second flow resistance carbon load, where the current differential pressure value is a current differential pressure value of two ends of the particulate matter trap, the first flow resistance carbon load is a flow resistance carbon load collected in a current collection period, the second flow resistance carbon load is the flow resistance carbon load collected in a previous collection period, and the flow resistance carbon load is a quantity of carbon contained in the particulate matter trap per unit mass or volume when a flow process of exhaust gas discharged from a vehicle in which the particulate matter trap is located is blocked by a blocking force after passing through the particulate matter trap;

A calculating unit 20 for performing a calculating step of determining a flow resistance carbon load change rate according to the first flow resistance carbon load, the second flow resistance carbon load, and the time length of the acquisition period;

A determining unit 30, configured to perform a determining step, that is, to perform timing when a first condition is satisfied and one or both of a second condition and a third condition are satisfied, until a duration of timing is greater than a set time limit value, determine that the filtering efficiency of the particulate matter trap is not acceptable, and end the monitoring, where the first condition is that the current differential pressure value is less than a differential pressure threshold value, the second condition is that a rate of change of the flow resistance carbon load is less than a rate of change threshold value, the third condition is that the first flow resistance carbon load is less than a predicted carbon load, and the predicted carbon load is a minimum value of a historical flow resistance carbon load of the current mileage of the vehicle;

Through the embodiment, the obtaining unit is configured to obtain a current differential pressure value, a first flow resistance carbon load and a second flow resistance carbon load, where the current differential pressure value is a current differential pressure value of two ends of the particulate matter trap, the first flow resistance carbon load is a flow resistance carbon load collected in a current collection period, the second flow resistance carbon load is the flow resistance carbon load collected in a previous collection period, and the flow resistance carbon load is a quantity of carbon contained in the particulate matter trap in a unit mass or volume when a flow process of exhaust gas discharged by a vehicle in which the particulate matter trap is located is blocked by the particulate matter trap; a calculating unit, configured to determine a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading, and the time length of the acquisition period; and the judging unit is used for timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing time is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle. According to the method, when the relation between the differential pressure value measured by the differential pressure sensor and the differential pressure threshold value, the change rate of the flow resistance carbon load and the relation between the flow resistance carbon load and the model carbon load and the relation between the flow resistance carbon load and the mileage carbon load are used, and when the continuous monitoring differential pressure value is smaller than the differential pressure threshold value, the change rate of the flow resistance carbon load is smaller than the change rate threshold value, the accumulated monitoring time of the flow resistance carbon load smaller than the model carbon load and the accumulated monitoring time of the mileage carbon load exceeds the set time limit value, the low filtration efficiency fault of the particulate matter catcher is reported. Under the condition of ensuring the monitoring effect, the upgrading cost is reduced, and the problem of inaccurate monitoring of the trapping efficiency of the particulate matter catcher is solved.

In order to reduce the frequency and range of monitoring and improve the monitoring efficiency and accuracy, in an alternative embodiment, the obtaining unit further includes:

the monitoring module is used for monitoring whether the particulate matter catcher meets a release condition, wherein the release condition is that the ambient pressure, the ambient temperature, the engine speed, the fuel injection quantity, the fuel liquid level, the volume flow of the exhaust gas and the accumulated carbon load are in a preset range, and the detection equipment and the particulate matter catcher are not in fault, and the detection equipment comprises a differential pressure sensor which is used for detecting the pressure difference value at two ends of the particulate matter catcher;

The circulation module is used for continuously monitoring the particulate matter catcher until the release condition is met under the condition that the release condition is not met;

A first obtaining module configured to obtain the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading when the release condition is satisfied;

In order to monitor the condition of the trapping efficiency of the particulate matter trap, in an alternative embodiment, the above-mentioned acquisition unit comprises:

a second obtaining module, configured to obtain the current differential pressure value, a previous differential pressure value, a first volumetric flow rate, and a second volumetric flow rate, where the previous differential pressure value is a differential pressure value of a previous collection period at two ends of the particulate matter trap, the first volumetric flow rate is the volumetric flow rate of the exhaust gas passing through the particulate matter trap in the current collection period, and the second volumetric flow rate is the volumetric flow rate of the exhaust gas passing through the particulate matter trap in the previous collection period;

A first calculation module, configured to obtain a first flow resistance according to a ratio of the current differential pressure value to the first volumetric flow rate, and obtain a second flow resistance according to a ratio of the previous differential pressure value to the second volumetric flow rate, where the first flow resistance and the second flow resistance are flow resistances of the exhaust gas in the current collection period and the previous collection period, respectively, and the flow resistance is a blocking force suffered by a flow process of the exhaust gas when the exhaust gas passes through the particulate matter trap;

A query module configured to look up a flow resistance carbon loading amount reference table according to the first flow resistance and the first volumetric flow rate to obtain the first flow resistance carbon loading amount, and look up a flow resistance carbon loading amount reference table according to the second flow resistance and the second volumetric flow rate to obtain the second flow resistance carbon loading amount, where the flow resistance carbon loading amount reference table is a reference table of the flow resistance carbon loading amount, the flow resistance and the exhaust volumetric flow rate;

In order to evaluate the trend of the flow resistance carbon loading, in an alternative embodiment, the above-mentioned calculation unit comprises:

a second calculation module for calculating the difference between the first flow resistance carbon loading and the second flow resistance carbon loading to obtain a flow resistance carbon loading variation difference;

The third calculation module is used for calculating the ratio of the flow resistance carbon load change difference value to the time length of the acquisition period to obtain the flow resistance carbon load change rate;

In order to further improve the accuracy of the monitoring, in an alternative embodiment, the apparatus further includes:

the third acquisition module is used for timing when one or two of the second condition and the third condition are met, until the timing duration is greater than a set time limit value and the filtering efficiency of the particle catcher is determined to be unqualified, acquiring a model carbon load and a mileage carbon load corresponding to a current mileage, wherein the model carbon load is a carbon load corresponding to the current mileage generated by simulation software for simulating the operation of the particle catcher, and the mileage carbon load is a carbon load of the particle catcher when the current mileage is driven in historical data;

A determining module configured to determine a minimum of the model carbon loading and the mileage carbon loading as the predicted carbon loading;

In order to find and deal with the problems of the particulate matter trap in time, the particulate matter trap trapping efficiency is more accurately estimated, and in an alternative embodiment, the above-mentioned determination unit includes:

the first timing module is used for timing when the first condition, the second condition and the third condition are met;

specifically, when the current differential pressure value measured by the differential pressure sensor is smaller than the differential pressure threshold value and the flow resistance carbon load change rate is smaller than the change rate threshold value and the flow resistance carbon load is smaller than the model predicted carbon load, the first condition, the second condition and the third condition are all met, and at the moment, the monitoring time begins to be accumulated, namely timing is performed.

A first zero clearing module configured to zero the time period of the timer when any one of the first condition, the second condition, and the third condition is not satisfied;

The first judging module sequentially repeats the first timing module and the first zero clearing module at least once until the timing duration is greater than the set time limit value, determines that the filtering efficiency of the particulate matter catcher is unqualified, and ends the monitoring;

specifically, the first timing module and the first zero clearing module are repeated at least once in sequence until the timing duration is greater than the set time limit value, which indicates that the particulate matter catcher fails to reach the required filtering efficiency within the set time, the filtering efficiency of the particulate matter catcher is determined to be unqualified, and the monitoring is finished. Therefore, the problem of the particle catcher can be found and treated in time, and the failure rate and the failure efficiency of the particle catcher can be more ensured when the second condition and the third condition are met, so that the normal operation of the particle catcher is ensured.

In order to evaluate the trapping efficiency of the particulate matter trap, in an alternative embodiment, the above-mentioned determination unit further comprises:

the second timing module is used for timing when the first condition is met and the second condition is met;

The second zero clearing module clears the time length of the timing when the first condition is not met and/or the second condition is not met;

The second judging module sequentially repeats the second timing module and the second timing module at least once until the timing duration is greater than the set time limit value, determines that the filtration efficiency of the particulate matter catcher is unqualified, and ends the monitoring;

specifically, the second timing module and the second timing module are repeated at least once in sequence until the timing duration is greater than the set time limit value, which indicates that the particulate matter catcher fails to reach the required filtering efficiency within the set time, the filtering efficiency of the particulate matter catcher is determined to be unqualified, and the monitoring is finished. Therefore, the problems of the particle catcher can be found and treated in time, and the normal operation of the particle catcher is ensured.

a third timer module configured to perform timer when the first condition is satisfied and the third condition is satisfied;

specifically, when the current differential pressure value measured by the differential pressure sensor is smaller than the differential pressure threshold value and the flow resistance carbon load is smaller than the expected carbon load of the model, the first condition is met and the second condition is met, and at the moment, the monitoring time begins to be accumulated, namely timing is performed.

The third zero clearing module clears the monitoring time at the moment under the condition that the first condition is not met and/or the third condition is met, namely clears the time length of the timing and finishes the monitoring;

specifically, when the current differential pressure value measured by the differential pressure sensor is greater than or equal to a differential pressure threshold value, or the flow resistance carbon loading is greater than or equal to the predicted carbon loading, that is, the first condition is not satisfied and/or the third condition is not satisfied, at this time, the monitoring time is cleared, that is, the time duration of the timing is cleared, and the monitoring is ended.

The third judging module sequentially repeats the third timing module and the third zero clearing module at least once until the timing duration is greater than the set time limit value, the filtering efficiency of the particulate matter catcher is determined to be unqualified, and the monitoring is finished;

Specifically, the third timing module and the third zero clearing module are repeated at least once in sequence until the timing duration is greater than the set time limit value, which indicates that the particulate matter catcher fails to reach the required filtering efficiency within the set time, the filtering efficiency of the particulate matter catcher is determined to be unqualified, and the monitoring is finished. Therefore, the problems of the particle catcher can be found and treated in time, and the normal operation of the particle catcher is ensured.

In order to avoid accidental errors, in an alternative embodiment, the apparatus further comprises:

a repeating unit configured to sequentially repeat the acquiring step, the calculating step, and the determining step until the monitoring is completed when one or both of the second condition and the third condition are satisfied and a time length of the time is less than or equal to the time limit value after the time counting is performed;

specifically, when the cumulative monitoring time in the case where the first condition is continuously monitored and one or both of the second condition and the third condition are satisfied does not exceed the time limit, it is indicated that the particulate matter trap can achieve the required filtration efficiency within the set time limit at this time, but the acquisition unit, the calculation unit, and the determination unit need to be sequentially repeated until the monitoring is ended in order to avoid an accidental error.

The monitoring device for the trapping efficiency of the particulate matter trap comprises a processor and a memory, wherein an acquisition unit, a calculation unit, a judging unit and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel can be provided with one or more than one kernel, and the problem of inaccurate monitoring of the trapping efficiency of the particle trap is solved by adjusting kernel parameters.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is located to execute the monitoring method of the trapping efficiency of the particulate matter trap.

Specifically, the method for monitoring the trapping efficiency of the particulate matter trap comprises the following steps:

step S201, obtaining a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value of two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading collected in a current collection period, the second flow resistance carbon loading is the flow resistance carbon loading collected in a previous collection period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is arranged is blocked by the blocking force when passing through the particle catcher;

step S202, determining a flow resistance carbon loading change rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period;

and step 203, timing is performed until the timing duration is greater than a set time limit value, determining that the filtering efficiency of the particulate matter trap is not qualified, and ending the monitoring when the first condition is satisfied and one or both of a second condition and a third condition are satisfied, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is a minimum value of the historical flow resistance carbon load of the current mileage of the vehicle.

The embodiment of the invention provides a processor, which is used for running a program, wherein the monitoring method of the trapping efficiency of the particulate matter trap is executed when the program runs.

The embodiment of the invention provides a vehicle, which comprises a particulate matter trap, a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor realizes at least the following steps when executing the program:

The present application also provides a computer program product adapted to perform a program initialized with at least the following method steps when executed on a data processing device:

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) Firstly, acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value at two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading acquired in a current acquisition period, the second flow resistance carbon loading is the flow resistance carbon loading acquired in the previous acquisition period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is positioned is blocked by the particle catcher; then, a calculation step of determining a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period; and finally, a judging step, namely, timing is carried out under the condition that a first condition is met, and one or two of a second condition and a third condition are met, until the timing time is longer than a set time limit value, determining that the filtering efficiency of the particulate matter trap is unqualified, and ending the monitoring, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is a minimum value of the historical flow resistance carbon load of the current mileage of the vehicle. According to the method, when the relation between the differential pressure value measured by the differential pressure sensor and the differential pressure threshold value, the change rate of the flow resistance carbon load and the relation between the flow resistance carbon load and the model carbon load and the relation between the flow resistance carbon load and the mileage carbon load are used, and when the continuous monitoring differential pressure value is smaller than the differential pressure threshold value, the change rate of the flow resistance carbon load is smaller than the change rate threshold value, the accumulated monitoring time of the flow resistance carbon load smaller than the model carbon load and the accumulated monitoring time of the mileage carbon load exceeds the set time limit value, the low filtration efficiency fault of the particulate matter catcher is reported. Under the condition of ensuring the monitoring effect, the upgrading cost is reduced, and the problem of inaccurate monitoring of the trapping efficiency of the particulate matter catcher is solved.

2) The monitoring device of the trapping efficiency of the particle trap comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, the current differential pressure value is a current differential pressure value at two ends of the particle trap, the first flow resistance carbon loading is a flow resistance carbon loading acquired in a current acquisition period, the second flow resistance carbon loading is the flow resistance carbon loading acquired in the previous acquisition period, and the flow resistance carbon loading is the quantity of carbon contained in the particle trap in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle trap is arranged is blocked by the particle trap; the calculating unit is used for determining the flow resistance carbon loading change rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period; and the judging unit is used for timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing time is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle. According to the method, when the relation between the differential pressure value measured by the differential pressure sensor and the differential pressure threshold value, the change rate of the flow resistance carbon load and the relation between the flow resistance carbon load and the model carbon load and the relation between the flow resistance carbon load and the mileage carbon load are used, and when the continuous monitoring differential pressure value is smaller than the differential pressure threshold value, the change rate of the flow resistance carbon load is smaller than the change rate threshold value, the accumulated monitoring time of the flow resistance carbon load smaller than the model carbon load and the accumulated monitoring time of the mileage carbon load exceeds the set time limit value, the low filtration efficiency fault of the particulate matter catcher is reported. Under the condition of ensuring the monitoring effect, the upgrading cost is reduced, and the problem of inaccurate monitoring of the trapping efficiency of the particulate matter catcher is solved.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method of monitoring the trapping efficiency of a particulate trap, the method comprising:

the method comprises the steps of obtaining a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, wherein the current differential pressure value is a current differential pressure value of two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading collected in a current collection period, the second flow resistance carbon loading is the flow resistance carbon loading collected in a previous collection period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is arranged is blocked by the particle catcher;

a calculation step of determining a flow resistance carbon loading rate according to the first flow resistance carbon loading, the second flow resistance carbon loading and the time length of the acquisition period;

And a judging step of timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing time is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle.

2. The method of claim 1, wherein obtaining the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading comprises:

monitoring whether the particulate matter trap meets a release condition, wherein the release condition is that the ambient pressure, the ambient temperature, the engine speed, the fuel injection quantity, the fuel liquid level, the exhaust gas volume flow and the accumulated carbon loading of the vehicle are in a preset range, and a detection device and the particulate matter trap do not malfunction, and the detection device comprises a differential pressure sensor which is used for detecting pressure difference values at two ends of the particulate matter trap;

Under the condition that the release condition is not met, continuing to monitor the particulate matter catcher until the release condition is met;

and under the condition that the release condition is met, acquiring the current differential pressure value, the first flow resistance carbon loading and the second flow resistance carbon loading.

3. The method of claim 1, wherein obtaining the current differential pressure value, the first flow resistance carbon loading, and the second flow resistance carbon loading comprises:

acquiring the current differential pressure value, a previous differential pressure value, a first volume flow and a second volume flow, wherein the previous differential pressure value is a differential pressure value of the two ends of the particulate matter trap in a previous collection period, the first volume flow is an exhaust gas volume flow passing through the particulate matter trap in the current collection period, and the second volume flow is the exhaust gas volume flow passing through the particulate matter trap in the previous collection period;

obtaining a first flow resistance according to the ratio of the current pressure difference value to the first volume flow, and obtaining a second flow resistance according to the ratio of the previous pressure difference value to the second volume flow, wherein the first flow resistance and the second flow resistance are respectively flow resistances of the exhaust gas in the current collection period and the previous collection period, and the flow resistance is a blocking force suffered by the flow process of the exhaust gas when the exhaust gas passes through the particulate matter trap;

And looking up a flow resistance carbon loading comparison table according to the first flow resistance and the first volume flow to obtain the first flow resistance carbon loading, and looking up the flow resistance carbon loading comparison table according to the second flow resistance and the second volume flow to obtain the second flow resistance carbon loading, wherein the flow resistance carbon loading comparison table is a comparison table of the flow resistance carbon loading, the flow resistance and the exhaust gas volume flow.

4. The method of claim 1, wherein determining a flow resistance carbon loading rate of change as a function of the first flow resistance carbon loading, the second flow resistance carbon loading, and a length of time of the acquisition period comprises:

calculating the difference value of the first flow resistance carbon loading and the second flow resistance carbon loading to obtain a flow resistance carbon loading change difference value;

and calculating the ratio of the flow resistance carbon load change difference value to the time length of the acquisition period to obtain the flow resistance carbon load change rate.

5. The method of claim 1, wherein in the event that the first condition is met and one or both of the second condition and the third condition are met, counting time is performed until the particulate trap filter efficiency is determined to be unacceptable when a length of time counted is greater than a set time limit, the method further comprising:

Obtaining a model carbon load corresponding to a current mileage and a mileage carbon load, wherein the model carbon load is a carbon load corresponding to the current mileage generated by simulation software for simulating the operation of the particulate matter catcher, and the mileage carbon load is a carbon load of the particulate matter catcher when the current mileage is driven in historical data;

determining a minimum of the model carbon loading and the mileage carbon loading as the predicted carbon loading.

6. The method according to any one of claims 1 to 5, wherein, in the case where the first condition is satisfied and one or both of the second condition and the third condition are satisfied, counting time is performed until a counted time period is greater than a set time limit value, determining that the particulate matter trap filter efficiency is not acceptable, and ending the monitoring, including:

a timing step of performing timing when the first condition, the second condition, and the third condition are satisfied;

a zero clearing step of clearing the time length of the timing under the condition that any one of the first condition, the second condition and the third condition is not met;

and sequentially repeating the zero clearing step and the timing step at least once, determining that the filtering efficiency of the particulate matter catcher is unqualified when the timing duration is greater than the set time limit value, and ending the monitoring.

7. The method according to any one of claims 1 to 5, wherein, in case the first condition is satisfied and one or both of the second condition and the third condition are satisfied, after timing, the method further comprises:

and if the time duration of the timing is less than or equal to the time limit value, sequentially repeating the acquisition step, the calculation step and the judgment step at least once until the monitoring is finished.

8. A monitoring device for particulate matter trap efficiency, the device comprising:

the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a current differential pressure value, a first flow resistance carbon loading and a second flow resistance carbon loading, the current differential pressure value is a current differential pressure value at two ends of a particle catcher, the first flow resistance carbon loading is a flow resistance carbon loading acquired in a current acquisition period, the second flow resistance carbon loading is the flow resistance carbon loading acquired in a previous acquisition period, and the flow resistance carbon loading is the quantity of carbon contained in the particle catcher in unit mass or volume when the flow process of exhaust gas discharged by a vehicle in which the particle catcher is arranged is blocked by the particle catcher;

A calculation unit for determining a flow resistance carbon loading rate of change according to the first flow resistance carbon loading, the second flow resistance carbon loading, and the time length of the acquisition period;

and the judging unit is used for timing when the first condition is met and one or two of the second condition and the third condition are met, determining that the filtering efficiency of the particulate matter catcher is unqualified and ending the monitoring when the timing duration is longer than a set time limit value, wherein the first condition is that the current differential pressure value is smaller than a differential pressure threshold value, the second condition is that the flow resistance carbon load change rate is smaller than a change rate threshold value, the third condition is that the first flow resistance carbon load is smaller than a predicted carbon load, and the predicted carbon load is the minimum value of the historical flow resistance carbon load of the current mileage of the vehicle.

9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 7.

10. A vehicle, characterized by comprising: a particulate trap, one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the method of any of claims 1-7.